Emami Mahnaz, Arab Amir Massoud, Ghamkhar Leila
University of Social Welfare and Rehabilitation Sciences, Evin, Tehran, Iran.
Department of Physical Therapy, University of Social Welfare and Rehabilitation Sciences, Evin, Tehran, Iran.
Int J Sports Phys Ther. 2014 May;9(3):312-9.
Altered muscular activation pattern has been associated with musculoskeletal disorders. Some previous studies have demonstrated muscle weakness or tightness in athletes who have sustained hamstring (HAM) injuries. However, no study has clinically investigated the muscular activity pattern in subjects with HAM strain injuries.
To investigate the activity pattern of the ipsilateral erector spinae (IES), contralateral erector spinae (CES), gluteus maximus (GM), and medial and lateral HAM muscles during the prone hip extension (PHE) test in athletes with and without history of HAM strain injury.
Cross-sectional non-experimental study design.
A convenience sample of 20 soccer athletes participated in the study. Subjects were categorized into two groups: those with history of HAM strain injury (n=10, mean age = 22.6 ± 3.74) and without history of HAM strain (n =10, mean age = 22.45 ± 3.77).
Three repetitions of the PHE were performed by each subject, and the electromyographic (EMG) outputs of the IES, CES, GM, and HAM muscles were recorded, processed and normalized to maximum voluntary electrical activity (MVE). Independent t-tests were used for comparing activation means of each muscle between athletes with and without history of HAM strain injury.
There were significant differences in EMG activity of the GM (p= 0.04) and medial HAM (p = 0.01) between two groups. No significant difference was found in EMG signals of the IES (p= 0.26), CES (= 0.33) and lateral HAM (p= 0.58) between the two groups. Greater although non-significant normalized EMG outputes of IES, CES and lateral HAM were seen in athletes with history of HAM strain compared to those without HAM strain.
The findings of this study demonstrated greater normalized EMG activity of GM and medial HAM tested in athletes with history of HAM strain compared to those without HAM strain (altered activation pattern).
3a.
肌肉激活模式改变与肌肉骨骼疾病有关。先前的一些研究表明，腘绳肌（HAM）受伤的运动员存在肌肉无力或紧张的情况。然而，尚无研究对HAM拉伤受试者的肌肉活动模式进行临床研究。
调查有和没有HAM拉伤病史的运动员在俯卧位髋关节伸展（PHE）测试期间同侧竖脊肌（IES）、对侧竖脊肌（CES）、臀大肌（GM）以及内侧和外侧HAM肌肉的活动模式。
横断面非实验性研究设计。
20名足球运动员的便利样本参与了本研究。受试者分为两组：有HAM拉伤病史的（n = 10，平均年龄 = 22.6 ± 3.74）和没有HAM拉伤病史的（n = 10，平均年龄 = 22.45 ± 3.77）。
每位受试者进行3次PHE测试，记录、处理IES、CES、GM和HAM肌肉的肌电图（EMG）输出，并将其归一化为最大自主电活动（MVE）。采用独立t检验比较有和没有HAM拉伤病史的运动员之间各肌肉的激活均值。
两组之间GM（p = 0.04）和内侧HAM（p = 0.01）的EMG活动存在显著差异。两组之间IES（p = 0.26）、CES（p = 0.33）和外侧HAM（p = 0.58）的EMG信号无显著差异。与没有HAM拉伤病史的运动员相比，有HAM拉伤病史的运动员中IES、CES和外侧HAM的归一化EMG输出虽然不显著但更高。
本研究结果表明，与没有HAM拉伤病史的运动员相比，有HAM拉伤病史的运动员测试时GM和内侧HAM的归一化EMG活动更高（激活模式改变）。
3a。
